Well zerkers that they are,
Id go for aggressive colors and iconography, red is nice, red and brass however is on the original
WE zerkers, so perhaps something like blood red/black or maybe something like bone helmets, with dark metallic trim and red armor, or you can try go like the abadon ones with black, and gold trim but with red helmets/shoulder pads. Try mathing up colors/hues to fit together to make agressive schemes marking, never hurts to practice on dummy models/parts. Personally
Id go for Dark grey and gold like you mentioned with all kinds of iconography on the flat bits of armor, I'd do it free hand though : > transfers are a no-no for me. Well
GL with whwatever you choose to go with!